Tool holder for metal working machines



No. 6l7,008. Patented Ian. 3, I899. J. J. DAHL. TOOL HOLDER FOR METALWORKING MACHINES. (Application filed May 4, 1898.\ (No Model.)

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TOOL- -HOLDER FOR METAL-WORKING MACHINES.

SPECIFICATION forming part of Letters Patent N 0. 617,008, dated January3, 1899.

Application filed May 4, 1898. Serial No. 679,738. (No model.)

To all whom it may concern.-

Be it known that I, J OACHIM J OHANNES DAHL, a subject of the GermanEmperor, and a resident of Hamburg, in the German Empire, have inventedcertain new and useful Improvements in Tool -I-Iolders for MetallVorkingMachines, of which the following is a specification.

This invention relates to tool-holders for metal-working machines, andparticularly for planing-machines, which are so arranged that the toolis'held in a separate sleeve or lining mounted in a reversible socket ofthe toolholder proper fixed to the slide-head of the machine. The saidsocket is automatically shifted or turned through an angle of onehundred and eighty degrees at the end of each stroke in well-knownmanner. In this reversible socket the sleeve or lining holding the toolis capable of being adjusted in position during the working of themachinethat is to say, the backward and forward movement of the work.

The invention is illustrated in the accompanying drawings, whichillustrate one practical form of construction, and in which- Figure 1shows a front view of a metal-planing machine with a tool-holder made inaccordance with this invention. Fig. 2 shows a front view of thetool-holder, drawn to a larger scale. Fig. 3 shows a similar view of thetool-holder, but partly in section, the cutting-tool and the socketcontaining it being turned through an angle of one hundred and eightydegrees. Fig. 4 is a vertical section on line 4 4, Fig. 2. Figs. 5 and 6are horizontal sections on lines 5 5 and 6 6 of Figs. 2 and 3,respectively.

Similar letters of reference indicate corresponding parts in all thefigures of the drawings.

The casin g a,forming the tool-holder proper, is arranged on ahorizontal pivot a on the slide-head A. of the planing-machine and isadapted to be fixed by clamping-screws a ar ranged in the slots (1Within this casing a is a socket b, which is held by nuts I) and b theupper end of the said socket being provided with a toothed wheel 19 andthe lower end with two diametrically-arranged notches or grooves b. Thesocket b, which is rotatable in the casing a, is secured in one or theother of its extreme positions by a springbolt 0, which fits into thegrooves 6 the said bolt being suitably arranged in a projection on thecasing CL and connected with a coupling-lever c, pivoted at c to thecasing a. The central opening of the socket bis widened at the lowerpart for the purpose of receiving a sleeve d, likewise provided with acentral aperture. As shown in Figs. 2, 3, and 4:, the sleeve d has atits lower end an enlarged vertically-slotted head, forming a shoulder orabutment that has bearing on the under side of the sleeve b, and in theslot of said head is pivoted a block (1 on a transverse pin d, so as tohave a limited swinging motion. The block d has a bore for the receptionof the tool 6, which latter is clamped in the block by means of aclamping-bolt d that works in a threaded opening of said block, orpreferably by means of such a bolt and a washer interposed between itand the tool, as clearly shown in Fig. 4. To prevent its falling out,the sleeve 61 is secured by two screw-bolts f, which pass through it andwhich are screwed into suitable slidepieces f f, preferably of T shape,situated in a groove of the socket b. The opening of the socket b issomewhat larger in the direction of the feed movement, (see Fig. 3,) soas to allow of a parallel movement being imparted to the sleeve cl inthe socket 1) during the working of the machine, and therefore to thetool itself a movement differential with respect to the feed motion.This movement can be effected bysuitable means for instance, by anendless screw g, fixed in the socket b, which engages suitable teeth outin the sleeve d, Fig. 4. To facilitate access to the adjusting-screw g,the casing CE is provided with two suitable recesses or gaps a.

The adj ustability of the tool above described in the reversiblesocketduring the working of the machine is of great importance, as it ispossible only by this to obtain in the forward as well as in thebackward movement of the work a uniform cut as well as to take off anequally thick shaving, as the tool can never be so exactly sharpened andset that it will always out uniformly even after being turned throughone hundred and eighty degrees.

The movement or reversal of the toolthat is to say, of the socketcarrying the said tool and its sleeveto the extent of one hundred andeighty degrees for allowing the forward or backward movement of the workIV, Fig. 1, which movement takes place at the end or during the changeof stroke of the table T, is effected in the following manner: A toothedsegment 2', adapted to be rotated on the axis 71, secured to the casinga, engages with the toothed wheel Z2 and turns the said wheel, and withit the tool 6 a, through an angle of one hundred and eighty degrees atevery movement from the one end position, Fig. 2, to the other, Fig. 3,and vice versa. The segment i is turned by a rope-pulley 70, connectedwith it, which pulley is turned in one or other direction by two ropes mand m, conducted over suitable guide-rollers Z and weighted with aweight Z. The alternate tightening and loosening of the two ropes m andm is effected simultaneously at the end of each stroke by the belt-forkp, which shifts the belts n and n from theloose pulleys 0 to the fixedpulley 0, to which fork the free ends of the ropes are fixed at p. Theshifting of the belt-fork p is effected by a horizontal rod g, which isworked in wellknown manner by suitable levers or even by hand.

The coupling of the segmenti and the ropepulley It has in bothdirections a certain lost motion, which serves to turn the lever c bymeans of a suitable cam k and to release thereby the spring-bolt c toset free the socket b. After the rotation or reversing of the socket l)or at the end of the turning motion of the rope-pulley 7t and thesegment 1', respectively, the spring-bolt c springs again into thegroove Z1 opposite to it, so as to hold the socket during the cuttingoperation.

Having fully described my said invention, what I claim, and desire tosecure by Letters Patent, is

1. In a metal-planer, the combination with the planer-head, a supportfor the tool-holder carried by said head, a tool-holder journaled insaid support to revolve about its vertical axis, and mechanism adaptedto impart to said tool-holder a semirotary motion, of adjusting devicesfor adjusting the tool-holder within its support in a direction at rightangles to the direction of motion of the work, for the purpose setforth.

2. In a metal-planer, the combination with the planer-head, a supportfor the to0l-holder secured thereto, and the tool-holder journaled insaid support; of the planer-head drivingshaft, mechanism for changingthe direction of rotation of said shaft, and appliances operated by saidmechanism for imparting a semirotation to the tool-holder, for thepurpose set forth.

3. In a metal-planer, the combination with the planer-head, a supportfor the tool-holder secured thereto, a tool-holder journaled in saidsupport, gearing adapted to impart rotary motion to the tool-holder, alocking-bolt for locking said holder against rotation, and a springoperating to hold said bolt in engagement with the holder; of mechanismoperating automatically and adapted to periodically move the aforesaidlocking-bolt out of engagement with the holder, impart to the latter asemirotary movement in one or the other direction and then release thebolt, for the purpose set forth.

4. The combination with the tool-holder support, a, the socket b, andthe endless screw g journaled in said socket; of the tool-holder cl,having lateral motion in socket b and being geared to the aforesaidscrew 9 for the purpose set forth.

5. The combination with the planer-head, a support for thetool-holdersecured thereto, the socket Z7 journaled in said support andhaving its lower end enlarged and abutting against the like end of itssupport, the toolholder journaled in said socket and having its lowerend enlarged and abutting against the like end of said socket, of theblock (1 for the reception of the tool pivoted in said enlarged end ofthe tool-holder, and means for clamping the tool to said block, for thepurpose set forth.

6. The combination with the planer-head, a support for the toolconnected therewith to swing on a horizontal pivot, the socket Z)journaled in said support and held against endwise motion therein; ofthe tool-holder journaled in said socket and having lateral motiontherein, said holder having an enlarged vertically-slotted lower end orhead, a block for the reception of the tool pivoted in the slot in saidhead and means for clamping the tool to said block, for the purposesspecified.

7. The combination with the planer-head, a support for the tool-holdersecured thereto, the socket b journaled in said support and providedwith two lock-notches b diametrically opposite each other and carrying abevel-wheel b at its upper end, the sleeve 01 connected with saidsocket, a spring-actu ated bolt adapted to engage one or the other ofthe notches b and the sleeve 0 fulcrumed to the aforesaid support; ofthe toothed segment 1' in gear with the bevel-wheel b and revoluble 011a spindle secured to the toolholder support, the cam 7t and rope-pulley71; revoluble on said spindle with the segmentgear, said cam adapted torock the aforesaid lever c, the ropes or cords m and m having one endsecured to said rope-pulley, and suitable guidepulleys whereby anoscillating motion in one or the other direction is imparted to thesegment-gear and cam substantially as and for the purpose set forth.

8. The combination with the spindle h, toothed segment i, rope-pulley7t, cam k, the parts actuated thereby and the ropes m and m having oneend secured to said rope-pulley; of the planer-bed-driving shaft, itsloose and fast belt-pulleys o, 0', the driving-belt and thebelt-shifting forks p to which the upper ends and geared at its upperend tosaid screw g, the block d arranged to swing 011 a horizontal pivotd at right angles to pivot 0, within a recess in the head of sleeve d,and the clamping screw-bolt d substantially as and for the purpose setforth.

J OACIIIM JOHANNES DAIIL.

\Vitnesses:

MAX LEMOKE, REINHARD OSTERMEYER.

